code: def preprocess(sentence):
      return [
          w for w in sentence.lower().split() if w not in stop_words
      ]
  
file_path: gensim/docs/src/gallery/tutorials/run_scm.py
imports: import matplotlib.pyplot
  import matplotlib.image
  import logging
  from nltk.corpus import stopwords
  from nltk import download
  from gensim.corpora import Dictionary
  from gensim.models import TfidfModel
  import gensim.downloader
  from gensim.similarities import SparseTermSimilarityMatrix, WordEmbeddingSimilarityIndex
label_desc: Use image node_id 1 for calling a global function with example usage: preprocess(sentence) and returns: unknown